'Daughters in law' in the Bible

Then she stood up with her daughters-in-law and returned from the country of Moab: for she had heard say, being in the country of Moab, how that the LORD hath visited his people and given them food.

Naomi said unto her two daughters-in-law, "Go, and return each of you unto your mother's house. The LORD deal as kindly with you, as ye have dealt with the dead, and with me."